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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>5.7.流程控制-循环结构-for循环-总练习1</title>
    <script>
        //一行打印几颗星星 ★
        //1.设定一个空值的字符串型 str
        //2.使用for循环
        //3.采取 追加字符串的方式 这样可以打印到控制台上
        /*         for (var i = 1; i <= 5; i++) {
                    console.log('★');
                } */
        /*         var str = '';
                for (var i = 1; i <= 5; i++) {
                    str = str + '★';
                }
                console.log(str); */
        var num = prompt('请输入星星个数');
        var str = '';
        for (var i = 1; i <= num; i++) {
            str = str + '★';
        }
        alert(str);
        console.log(str);
    </script>
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